okay, here's the whole solution:
the y- axis shift was due to offset, that was fine, however, why was ther no amplification, even though it is
-1/(RC)integralof V dt
well, when considering sin(x), it is important to include the frequency f!!!
therefor:
sin(2pi*f*t)
just integrating this term will give:
-1/(2pi*f)cos(2pi*f*t) + c
considering f as a constant in the integration
when now the amplification of -1/(RC) is applied, we get A=1/(RC2pif)
which is at the frequency corresponding to the RC - value approximately one. It gave me a 95%-99% yield, considering high school lab equipment not too bad
so, the output curve should really look something like: (1/(RC2pif))cos(2pift)
which fits my results, except that offset, which can b negleted comparing phase relations and amplitudes
so, that was just really to finish off. I gonna post, my finished essay sometime, as soon i finish it and sent it off.
thanx a lot for your help guys, might need it again, as soon i stumble over the next thing
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Jon